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Chapter 5
SONET Topologies
Figure 5-26 Using the span shortcut menu to display circuits
On the Circuits on Span dialog box
Step 3
circuits away menu:
•
CLEAR removes a previously-set switch command.
•
MANUAL switches the span if the new span is error free.
FORCE forces the span to switch, regardless of whether the new span is error free.
•
•
LOCKOUT locks out or prevents switching to a highlighted span. (LOCKOUT is only available
when Revertive traffic is enabled.)
Caution
FORCE and LOCKOUT commands override normal protective switching mechanisms. Applying
these commands incorrectly can cause traffic outages.
November 2001
(Figure
5-27), select the protection from the Switch all UPSR
Cisco ONS 15454 Installation and Operations Guide
Unidirectional Path Switched Rings
5-33
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